As we all know the best is to have fixed bed time and fixed waking up time in order not to feel tired. However life does not always allow this.
If you need to reduce your sleeping time (or at the opposite increase your sleep time during the weekend in order to catch up) is it better to shift the time your going to bed or the waking up time ? Is one of the two options better in handling these variation of sleeping time or does it make no difference ?
Edit : This question is asked because I have intensive sport trainings (dance+gym(acrobatics)) at fixed time several days and I have to work a given amount of hours (amount which can vary) for my job but I'm free to adjust my timetable (bed/waking up time) as long as I do my job hours. That's why I'm asking when I have a variation of working hour, is one of the two option better in order to be the less tired for sport training. (However it's true that it may also be applied in general outside of Physical Fitness so maybe it's off topic)